Fuel-feed chute for underfeed stokers



Patented Aug. f3, 1926.

UNITED STATES v 1,594,560 l ATENT OFFICE.-

ROBERT S. RILEY, F WORCESTER, MASSACHUSETTS, ASSIGNORTO SANFQRD RILEY STOKER CO., OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHU- SF-TTS.

FUEL-FEED CHUTE FOB pnnnnrnnn STOKERS.

. q Application filed December 31, 1921. Serial No. 526,289. 1

This invention relates to an underfeed stoker and particularly to the provision of means by which certain parts of the fuel feed chute may be readily removed and replaced when worn.

It is customary to provide an inwardly enlarged fuel chute between the rear of thefuel hopper and the front end of the stoker retort. This chute extends through the front wall of the stoker, and as heretofore made has partially supported the wall itself. Under these conditions the removal of the chute for repair or replacement has frequently resulted in weakening or destroying the wall.

It is the object of my present invention to provide a construction of feed chute in which Fig. 1 is a sectional elevation of my improved feed chute, taken along the line 11 in Fig. 2;

Fig. 2 is a rear elevation thereof, and Fig. 3 is a detailed view of one of the inner side plates.

Referring to the drawings, I have shown a portion 10 ofthe cylinder which supports the usual fuel hopper of an underfeed stoker and connects the same with the feedchute through which the fuel is admitted to the upper end of aretort. The cylinder 10 has a rearwardly extended portion 10 which projects a considerable distance into the front wall 11 of the furnace, and may be supported upon a post 12, embedded in the lower portion of the wall. r

This rearwardly extended position 10*. of the cylinder member 10 is substantially U- shape in cross-section, as clearly shown in Fig. 2, and may be provided with guideopenings l3-to receive slide rods which operof stoker.

A bell-shaped top-platel i is supported above the rearwardly extended portion 10 of the cylinder 10 in any convenient manner ate the movable side walls ofa certain typetobe described. At its front end, the plate 14. is secured by bolts 17 to a flange 18 formed on the cylinder 10.

A bell-shaped bottom plate disposed G lof'the cylinder 10 and is secure 'to the cylin- I der 10 at its front end by a bolt 21. The" nut for the bolt is located in an opening within the inwardly extendin portion'lO 22 in a downwardly extending'post or lug 24 which also supports the plate upon the irrner lower surface of the portion 10 of the 1 cylinder 10. A lug 25 extendsdownwardly and rearwardly at the back end of the plate 206 and supports the front end of'a plate 26 which forms a portion of the stoker retort, the parts being secured together by a'bolt or rivet 27 dropped into aligned openings therein. 4

A pair of side-plates 30 are mounted between the upright sides of the portion 10 of the cylinder 10 '(as shown in Fig. 2), their ends being secured 'to the flange ofthe cylinder by :bolts 31. The nuts for these bolts are disposed in retangular openings 32 in the plates, the boltsextending through suit able passages 33 therein. The plates 30 are wedge-shaped in outline and larger at their rea'rends and are provided with notches 34 at their upper rear corners, adapted to receive the lugs 16 of the top plate 14. These lugs 16 thus act to prevent rearward displacement of the side plates in addition to the bolts; 31. The wedge-shaped outline of the side iplates also enables the plates to act as keys :to hold the top and bottom plates firmly in position. 1

O'utward lateral movement of' the side pla't'esis likewise prevented by'engagement thereof with the inwardly projected U- shaped end portion 10 of the cylinder 10 which forms in effect outer side walls for the fuel chute.

Having described the construction of my expense.

' loy satisfying these requirements includes which supports the wall 11. Furthermore, these removable plates 20 and 30 are all simple castin s which may be quickly and easily made, an which may be replaced at small In removing these parts, the bolt 27 is taken out and the bottom plate 26 is lifted from position. The bolts 31 are then loosened and the rear portions of the side plates 30 are pressed toward each other to clear the lugs 16. The plates may then be removed rearwardly after which the bolt 21 is loosened and the bottom plate 20 may be easily removed.

It has been found "by experience that the arts of a stoker subject to contact with the uel wear rapidly, partially due to abrasion by the fuel and partially to the fact that the sulphur and moisture in the fuel tends to evolve a weak acid which attacks the metal, particularly when it is freshly abraded by the fuel.

With my improved invention, these parts subject to rapid wear may be readily and easily replaced without replacing the more expensive portions of the stoker and the setting thereof.

Under conditions of severe service I contemplate the provisionof parts made of acid-proof iron alloy or other acid-proof metal which will resist corrosion and reduce the frequency of replacement. One iron al- 1n its composition 1.2% carbon, 13% silicon and fractional percentages of manganese, potassium and sulphur.

,Having thus described my invention, it will be evident that changes and modifications can be made therein by those skilled in the art, within the scope and spirit of my invention as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but what I claim is 1. In an underfeed stoker having a front wall, a fuel feed chute having a permanently positioned outer wall-supporting cas ing and a plurality of sectional renewable inner wearing members extending substantially through said outer casing from the outside to the inside of said wall and forming the fuel-engaging portions of said chute, said inner members being easily removable and replaceable in said casing.

A fuel feed chute for an underfeed stoker, comprising an outer member, a top plate supported thereby, and renewable inner members detachably secured within said outer member.

3. A feed chute for an underfeed stoker, comprising a U-shaped outer casing, a top plate supported thereby, and removable innet side and bottom plates detachably secured in said casing.

4:. A feed chute for an underfeed stoker, comprising an outer load-supporting structure and an inner renewable wear-receiving structure including separate side and bottom plates detachably secured within said outer structure and easily removable therefrom.

5. A fuel feed chute for an underfeed stoker comprising permanently positioned outer side Walls, a top plate supported thereby, and inner side platesdetachably secured in position between said outer side walls.

6. A feed chute for an underfeed stoker, comprising an outer load-supp0rting structure including a top plate, a renewable bottom plate, and wedge-shaped inner side' plates secured between the top and bottom plates, and preventing displacement thereof.

7. A fuel feed chute for an underfeed stoker, comprising an outer member, a top plate supported thereby, and renewable inner members detachably secured within said outer member, certain of said members being wedge-shaped and having shoulders engaged by said top plate to prevent rearward movement thereof.

8. A feed chute for an underfeed stoker, comprising an outer load-supporting structure and an inner wear-receiving structure formed of acid-proof metal.

In testimony whereof I have hereunto affixed my signature.

ROBERT SANFORD RILEY. 

